苯乙烯装置的清洁生产方案及实施效果

分析了苯乙烯装置的主要污染源及装置能耗高、物耗高和污染重的重点部位,介绍了主要的清洁生产方案,并对方案实施后产生的效果进行了分析。     

衣康酸/苯乙烯磺酸共聚物的合成及其阻垢性能研究

以衣康酸(IA)和苯乙烯磺酸(SSA)为原料,合成IA／SSA共聚物阻垢剂,确定的最佳合成条件：反应温度为103℃,反应时间为2h,引发剂用量为7％(占单体总质量),IA：SSA质量比为2．8：1。在此工艺条件下合成的IA／SSA共聚物阻垢剂,其阻碳酸钙垢的阻垢率可达99％。     

液体吸收-活性炭吸附净化苯乙烯废气

介绍了液体吸收-活性炭吸附净化苯乙烯废气的原理.当吸收液中石油类物质占总体积的40％时吸收率最佳,小试液体吸收段对苯乙烯废气的吸收率在74％-97.6％之间,在工业净化装置中使用该吸收液,对苯乙烯废气的吸收率在60％-97.4％之间.活性炭对苯乙烯的吸附率为自重的30％.工业净化装置中,两种方法并用苯乙烯废气的净化效率在94.8％以上.该方法关键是寻找高效的吸收液和设计实用的净化装置.     

二甲基二烯丙基氯化铵的合成

为制备聚二甲基二烯丙基氯化铵絮凝剂,采用二步法制备了二甲基二烯丙基氯化铵单体,即在强碱性条件下由烯丙基氯和二甲胺反应先生成二收藏 －烯丙基叔胺,将该叔胺分离出来并再次加入烯丙基氯同会２丙介质中结晶析出委胺晶体。     

真菌生物滤池净化苯乙烯废气的研究

采用接种Aspergillus candidus和Penicillium frequentans的真菌生物滤池处理苯乙烯废气,考察苯乙烯在生物滤池中的净化效果和物质转化特性。苯乙烯的进气质量浓度为200～800 mg/m3,气体流量分别为0.28,0.38和0.48 m3/h,对应的气体停留时间分别为60,45和35 s。试验结果表明:苯乙烯在真菌生物滤池中有较好的处理效果,最大去除能力达66.78 g/(m3.h),真菌生物滤池中二氧化碳的产生量和苯乙烯去除量呈线性关系。微生物分析结果表明,接种的Aspergillus candidus和Penicillium frequentans在反应器内能够长期保持优势地位。     

Optimization of the recovery of plastics for recycling by density media separation cyclones

Material recovery processes are presented as the optimum option for recycling plastic wastes as a means of recovering hydrocarbon resources. There exist a large variety of automated material recovery processes for recycling of such wastes but each with significant limitations. Of these, the separation based on differences in densities is advocated as the optimum process either for producing recycled products or preparing wastes for subsequent recovery processing.Density separation processes based on cyclone type density media separation (DMS) is presented as an important, potential method for increasing plastics recycling process capacities. It is demonstrated to have the capacity to separate a significantly larger range of particle sizes than those presently processed industrially. The mathematical relationship for the prediction of quality of typical LARCODEMS type density media separations by particle size and density as expressed by the Ecart Probable is presented.A proposed device configuration is presented for density media separation to optimize the recovery and purity of both density fractions produced. It is also suggested that to be economically viable, a large scale of operation is required for industrial plastics recycling operations recovering and producing a number of different plastics with a purity to be used as a substitute for virgin material.     

链状高分子金属配合物催化氧化苯乙烯

利用链状Salen型高分子希夫碱金属配合物PLSBM(M:CoⅡ,MnⅡ,ZnⅡ,CuⅡ)作为催化剂,催化分子氧氧化苯乙烯.结果表明,在不添加任何助剂和共还原剂的条件下,氧化产物以苯甲醛(Ⅰ)和环氧苯乙烷(Ⅱ)为主,PLSBCuⅡ具有最佳的催化活性和产物选择性.考察了影响氧化反应的因素,发现在反应温度为90℃、反应时间为9h和催化剂与苯乙烯用量比为1mg∶2mL时,苯乙烯具有最优的转化率(61％)和产物选择性(Ⅰ:57％,Ⅱ:36％).     

介质阻挡放电降解苯乙烯的研究

研究了介质阻挡放电(DBD)常压下降解流动态苯乙烯时,不同电压、流速、初始浓度及湿度下苯乙烯的降解情况.结果表明,DBD降解苯乙烯15~20min即可达稳定,产物主要为CO、CO₂和H₂O;电压4800V时有少量带苯环的气态及固态物质产生,且随电压的升高而减少,到7500V时红外光谱已无法检测到;高电压下放电可以取得90%左右的降解率,产生带苯环的气态物质和结焦物质较少.流速在1.5cm/s,浓度为3000mg/m³,相对湿度为20%左右时,降解效果最好.     

Investigation of protein-styrene oxide adducts as a molecularbiomarker of human exposed to styrene

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生物法净化低浓度苯乙烯有机废气填料的选择及运行功效

采用培养驯化的污泥菌种,对1#陶粒、2#陶粒、塑料小球和沸石4种填料进行生物挂膜,通过对比筛选,选择性能优越的1#陶粒作为滴滤塔填料净化苯乙烯废气,结果表明,在进气量Q=0.6 m3/h,循环喷液量L=90 L/min,进气负荷小于180 g/(m3·h),去除负荷可达到163 g/(m3·h),苯乙烯净化效率达到90%以上.